Abstract
Absolute photoabsorption cross sections of C 60 thin films are determined in the hν range from 1.3 to 42 eV by using photon attenuation method. The spectrum shows a prominent peak of 1180 Mb at 22.1 eV with several fine structures due to single-electron excitation similarly to the case of C 60 in the gas phase. The complex refractive index and complex dielectric function are calculated up to 42 eV through the Kramers–Kronig analyses. From the present data of C 60 thin films the cross section curve of a molecular C 60 is calculated with an assumption that the polarization effect of surrounding C 60 molecules can be expressed by the standard Clausius–Mossotti relation. The spectrum thus obtained shows an excellent agreement with that of C 60 in the gas phase measured independently.
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